I just completed the update.
When I finished the update tp (SP1) I got an error message; "An unknown error has occurred. Please contact technical support.", the message also stated that i was trying to install SP0. Weirdness.
I didn't contact VectorWorks, instead I closed the window, restarted VectorWorks 2019 and it seems to be working OK with Mojave OS!
I appreciate the update, wish I didn't waste so much time and energy.